How Much Protein You Should Eat Every Day to Build Muscle (Real Numbers, Not Bro-Science)
Nutrition · 2026-02-17 · 6 min read
Research-backed protein targets to build muscle — 1.6 to 2.2 g/kg of bodyweight per day, with a full day of example meals hitting 150g.
If you look through any fitness subreddit for 10 minutes, you'll see the same question a hundred times: "How much protein do I really need?" The official recommended daily allowance (RDA) is 50g, but a bodybuilding forum says it could be as high as 400g. The truth is that the answer is in a narrow range and not as high as bro-science says, but higher than what most dieticians say.
This guide cuts through the noise with numbers that are backed by real research, not Instagram stars trying to sell you protein powder.
The short answer is
To get bigger muscles, you need to eat 1.6 to 2.2 grams of protein for every kilogram of bodyweight you have (0.7 to 1.0 grams for every pound).
Anything over 2.2 g/kg has no effect on building muscle; it just makes your pee more expensive. Anything less than 1.6 g/kg means you won't get any muscle-building benefits.
If you weigh 180 pounds (82 kg) and lift weights regularly, you need 130 to 180 grams of protein every day. You can use our free protein calculator to figure out how much protein you need based on your weight and goal.
Where the number came from
The 1.6 g/kg floor comes from a 2018 meta-analysis by Morton et al. in the British Journal of Sports Medicine. They looked at 49 studies and found that trained lifters' muscle-protein synthesis stopped increasing around 1.6 g/kg. It didn't hurt to go higher, but it didn't help either.
The 2.2 g/kg limit comes from research on cutting (calorie deficit). When you're on a diet, a little extra protein helps keep your muscles because your body is in a negative nitrogen balance. There is no extra benefit once you go over 2.2 g/kg, even on a cut.
Protein goal by target
| Goal | g/kg bodyweight | Example: 80kg (176lb) person |
|---|---|---|
| Not lifting, sitting still | 0.8–1.0 | 65–80 g/day |
| Lifting weights for general fitness | 1.4–1.6 | 112–128 g/day |
| Lifting to build muscle | 1.6–2.0 | 128–160 g/day |
| Lifting while cutting (losing fat) | 1.8–2.2 | 144–176 g/day |
| Adults over 50 who lift | 1.8–2.2 | 144–176 g/day |
For people with a lot of body fat (>25% men / >32% women), don't use your total weight to figure out how much protein you need. Instead, use your lean body mass or goal weight. A person who weighs 110 kg and has 35% body fat doesn't need 220 g of protein; they only need about 140 g (based on their lean mass of 70 kg times 2.0).
Does timing matter?
The "anabolic window" is mostly a myth. What matters is how much protein you eat each day and how you spread it out over 3 to 5 meals of about 30 to 50 g each. Three 50g meals are better than one big 150g protein dinner.
Why: About 0.4 g/kg per meal is the most that can be done to boost muscle-protein synthesis. Beyond that, the extra just turns into energy. So, for a person who weighs 80 kg, the most MPS they can get is about 32 g of protein per meal. If they split it up into 4 to 5 meals, they will get 4 to 5 full MPS pulses a day instead of just one big one.
What 150 grams of protein really looks like
Numbers on a calculator don't mean anything. Here's a real day hitting 150 grams:
| Meal | Food | Protein |
|---|---|---|
| Breakfast | 3 whole eggs and 150g of Greek yoghurt | 35 g |
| Lunch | 150g of grilled chicken breast, rice, and vegetables | 45 g |
| Snack | 1 scoop of whey protein and a banana | 25 g |
| Dinner | 180 grams of salmon or lean beef and potato | 45 g |
| Total | Spread out over four meals | 150 g |
Do you need a shake with protein?
Not strictly; whole foods are fine. But getting 150 to 180 g from just chicken, eggs, and beef takes time, hunger, and cooking. The easiest way to close the gap is to drink a 25 g protein shake between meals. Whey absorbs the fastest, casein absorbs the slowest, and plant blends (like pea and rice) are almost as good as whey when mixed together.
Is too much protein bad for your kidneys?
No, not in people who are healthy. The claim that "high protein damages kidneys" comes from studies of people who already had kidney disease, in which case the advice is to eat less protein. Healthy adults can eat up to 3.0 g/kg without harming their kidneys. No matter what the internet says, you should see your doctor if you already have kidney disease.
Use our free calculators to figure out your protein target and TDEE. If you're cutting, check your deficit maths. You can tell the difference between muscle gain and fat gain by getting a weekly AI body fat scan.
Keep reading
- Why most men over 40 never get lean — in 16 slides — The hidden calories you never sat down for, why the weekend cancels the week, and the skill of being slightly hungry without treating it as an emergency.
- DUP-3: Why I Train the Same Muscle at Three Different Rep Ranges Each Week — Rhea 2002: same exercises, same total volume, half the time — DUP gained 2x more strength than linear periodization. The 3-rotation version, in plain words.
- APRE 10: The Quiet Algorithm That Picks Your Working Weight For You — Mann's D-1 football protocol in 4 sets. Why the algorithm out-progresses linear programs by ~2x on bench and squat — and how to run it without thinking.
- Best Exercises for Biceps Peak (And the Honest Truth About Genetics) — Why biceps peak is 70% genetics and 30% training — and the exact 30% you can change with long-head-biased curls.
- The 60-Second Scan: How to Read a Restaurant Menu for Calories — Why "grilled chicken salad" can be 1,100 calories, and how 6 menu keywords tell you everything about calorie density in under a minute.
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